diff --git a/plugins/wporg-5ftf/includes/contributor.php b/plugins/wporg-5ftf/includes/contributor.php
index 8d9b618..8bc5177 100644
--- a/plugins/wporg-5ftf/includes/contributor.php
+++ b/plugins/wporg-5ftf/includes/contributor.php
@@ -402,3 +402,58 @@ function process_my_pledges_form() {
 
 	return $message;
 }
+
+/**
+ * Ensure each item in a list of usernames is valid and corresponds to a user.
+ *
+ * @param string $contributors A comma-separated list of username strings.
+ *
+ * @return array|WP_Error An array of sanitized wporg usernames on success. Otherwise WP_Error.
+ */
+function parse_contributors( $contributors ) {
+	$invalid_contributors   = array();
+	$sanitized_contributors = array();
+
+	$contributors = str_replace( '@', '', $contributors );
+	$contributors = explode( ',', $contributors );
+
+	foreach ( $contributors as $wporg_username ) {
+		$sanitized_username = sanitize_user( $wporg_username );
+		$user               = get_user_by( 'login', $sanitized_username );
+
+		if ( ! $user instanceof WP_User ) {
+			$user = get_user_by( 'slug', $sanitized_username );
+		}
+
+		if ( $user instanceof WP_User ) {
+			$sanitized_contributors[] = $user->user_login;
+		} else {
+			$invalid_contributors[] = $wporg_username;
+		}
+	}
+
+	if ( ! empty( $invalid_contributors ) ) {
+		/* translators: Used between sponsor names in a list, there is a space after the comma. */
+		$item_separator = _x( ', ', 'list item separator', 'wporg-5ftf' );
+
+		return new WP_Error(
+			'invalid_contributor',
+			sprintf(
+				/* translators: %s is a list of usernames. */
+				__( 'The following contributor usernames are not valid: %s', 'wporg-5ftf' ),
+				implode( $item_separator, $invalid_contributors )
+			)
+		);
+	}
+
+	if ( empty( $sanitized_contributors ) ) {
+		return new WP_Error(
+			'contributor_required',
+			__( 'The pledge must have at least one contributor username.', 'wporg-5ftf' )
+		);
+	}
+
+	$sanitized_contributors = array_unique( $sanitized_contributors );
+
+	return $sanitized_contributors;
+}
diff --git a/plugins/wporg-5ftf/includes/endpoints.php b/plugins/wporg-5ftf/includes/endpoints.php
index 427059a..ffe9c85 100644
--- a/plugins/wporg-5ftf/includes/endpoints.php
+++ b/plugins/wporg-5ftf/includes/endpoints.php
@@ -5,7 +5,7 @@
 
 namespace WordPressDotOrg\FiveForTheFuture\Endpoints;
 
-use WordPressDotOrg\FiveForTheFuture\{ Auth, Contributor, Email, PledgeForm };
+use WordPressDotOrg\FiveForTheFuture\{ Auth, Contributor, Email };
 use const WordPressDotOrg\FiveForTheFuture\PledgeMeta\META_PREFIX;
 
 add_action( 'wp_ajax_manage-contributors', __NAMESPACE__ . '\manage_contributors_handler' );
@@ -54,7 +54,7 @@ function manage_contributors_handler() {
 
 		case 'add-contributor':
 			$pledge = get_post( $pledge_id );
-			$new_contributors = PledgeForm\parse_contributors( $_POST['contributors'] );
+			$new_contributors = Contributor\parse_contributors( $_POST['contributors'] );
 			if ( is_wp_error( $new_contributors ) ) {
 				wp_die( wp_json_encode( [
 					'success' => false,
diff --git a/plugins/wporg-5ftf/includes/pledge-form.php b/plugins/wporg-5ftf/includes/pledge-form.php
index a7cf3c9..9fd1170 100755
--- a/plugins/wporg-5ftf/includes/pledge-form.php
+++ b/plugins/wporg-5ftf/includes/pledge-form.php
@@ -70,7 +70,7 @@ function process_form_new() {
 		return $has_error;
 	}
 
-	$contributors = parse_contributors( $submission['pledge-contributors'] );
+	$contributors = Contributor\parse_contributors( $submission['pledge-contributors'] );
 	if ( is_wp_error( $contributors ) ) {
 		return $contributors;
 	}
@@ -219,61 +219,6 @@ function get_form_submission() {
 	return $result;
 }
 
-/**
- * Ensure each item in a list of usernames is valid and corresponds to a user.
- *
- * @param string $contributors A comma-separated list of username strings.
- *
- * @return array|WP_Error An array of sanitized wporg usernames on success. Otherwise WP_Error.
- */
-function parse_contributors( $contributors ) {
-	$invalid_contributors   = array();
-	$sanitized_contributors = array();
-
-	$contributors = str_replace( '@', '', $contributors );
-	$contributors = explode( ',', $contributors );
-
-	foreach ( $contributors as $wporg_username ) {
-		$sanitized_username = sanitize_user( $wporg_username );
-		$user               = get_user_by( 'login', $sanitized_username );
-
-		if ( ! $user instanceof WP_User ) {
-			$user = get_user_by( 'slug', $sanitized_username );
-		}
-
-		if ( $user instanceof WP_User ) {
-			$sanitized_contributors[] = $user->user_login;
-		} else {
-			$invalid_contributors[] = $wporg_username;
-		}
-	}
-
-	if ( ! empty( $invalid_contributors ) ) {
-		/* translators: Used between sponsor names in a list, there is a space after the comma. */
-		$item_separator = _x( ', ', 'list item separator', 'wporg-5ftf' );
-
-		return new WP_Error(
-			'invalid_contributor',
-			sprintf(
-				/* translators: %s is a list of usernames. */
-				__( 'The following contributor usernames are not valid: %s', 'wporg-5ftf' ),
-				implode( $item_separator, $invalid_contributors )
-			)
-		);
-	}
-
-	if ( empty( $sanitized_contributors ) ) {
-		return new WP_Error(
-			'contributor_required',
-			__( 'The pledge must have at least one contributor username.', 'wporg-5ftf' )
-		);
-	}
-
-	$sanitized_contributors = array_unique( $sanitized_contributors );
-
-	return $sanitized_contributors;
-}
-
 /**
  * Check the submission for valid data.
  *